Bottle stopper



FIG. 1 is a front isometric view of a bottle stopper;

FIG. 2 is a rear isometric view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a right view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The dash-dash broken lines depict unclaimed subject matter. The broken lines and unshaded surfaces bounded by broken lines form no part of the claimed design. 

CLAIM The ornamental design for a bottle stopper, as shown and described. 